46 Water / Wastewater Expanded Oceanographic and Environmental Sediment Instrument Range


For over 20 years, Aquatec Group has been designing and manufacturing instrumentation for observing suspended sediment, including the market leading AQUAscat acoustic profi lers. Now Aquatec is expanding beyond suspension with the new Sediment? Solved range, with the introduction of products from KC-Denmark for the collection of suspended, bedload and deposited sediment, including grabs, corers and sediment traps. Aquatec can now offer a complete range of oceanographic and environmental instruments for observing and collecting sediment.


Aquatec’s core expertise lies with suspended sediment instrumentation, and their fl agship AQUAscat and AQUAlogger 210TY product lines, allowing customers to measure turbidity using optical backscatter and observe suspended sediment using multi-frequency acoustics. With Sediment? Solved, customers can now collect sediment in suspension too, with KC-Denmark’s sediment traps and water samplers. The collected sediment can be analysed in the lab to build a bigger picture of the environment, and provide the data needed for converting turbidity to suspended sediment concentration. For bedload and deposited sediment, a comprehensive range of corers and grabs is now available.


Aquatec can also provide integrated solutions, bringing together multiple technologies to suit individual project requirements. Complete systems can be designed to measure sediment throughout the natural environment, bringing together Sediment? Solved products and Aquatec’s extensive expertise in instrument, communication and system design.


Andy Smerdon, Managing Director, said ‘We are delighted to include products from KC-Denmark in our Sediment? Solved range. This allows us to offer our customers a wider range of oceanographic and environmental sediment instruments, building upon our years of experience in suspended sediment instrument design and manufacture.’


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42031pr@reply-direct.com Ultrasonic Meter Used for Aquatic


Exhibits in UK Zoos Bell Flow Systems were recently approached by a company who specialize in the set up and maintenance of aquatic exhibits in zoos around the UK.


The company required a fl exible, portable metering option, which would allow their engineers to measure the fl ow rate in a variety of pipe sizes without having to interrupt the fl ow or disturb the animals.


With inherent advantages over traditional in-line fl ow meter technologies, the cost-effective BFU-100-H handheld portable ultrasonic heat meter was chosen. The ultrasonic fl ow meter was supplied, as it allowed the engineers to use the same meter at various zoos, on a wide range of pipe sizes and materials, without having to cut into the pipe and cause potential contamination issues.


t. 0800 8046 062 www.atiuk.com Modular, multi-parameter


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MetriNet_125x86mm_IET.indd 1


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7507ad@reply-direct.com Non-Porous Reference Electrodes REFEX Advert IET Jan v2.qxp_Layout 1 02/02/2017 11:04 Page 1 water quality monitors for networks 17/10/2016 21:23


The BFU-100-H is a battery powered, non-invasive meter which clamps on to the outside of virtually any pipe material, from 25mm to 700mm in diameter and is accurate to ±1%. Featuring fl exible installation in which the meter can be mounted both horizontally or vertically, if required. Models can display instantaneous fl uid fl ow rates or velocity, together with 4 different totalised values and are capable of transmitting a signal to an external logger of BMS using Pulse and 4-20mA signals.


The meter was used to ensure the effi ciency of their fi ltering and pumping systems for aquatic exhibits, for a wide range of creatures from jellyfi sh to penguins, to ensure the water quality was good enough to keep them all healthy and happy.


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for pH Measurement and Control of Brines Chlorine gas is produced in a membrane cell chlor-alkali process. Saturated brine is introduced into a high voltage electrolysis cell where chloride ions are oxidised to chlorine gas at the anode. To optimise yield while minimising corrosion damage to the expensive electrolysis membrane cell, brine pH must be carefully controlled between pH 2.00 and pH 4.00 by the addition of HCl.


REFEX sensors ltd TM pH “The First to Last”


REFEX manufacture a variety of pH sensor types, for many industrial processes and for general purpose applications


• Fast and Accurate Measurement • Very Low Drift – virtually maintenance free • Exceptionally Long Life - up to 5 years in many cases • Compatible with Existing pH Instruments • Resistant to Fouling and Poisoning • Free Sample - Try It, Buy It - Free 90 Day Trial, No Obligation


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Depleted brine from the cell is re-saturated with salt in a recirculation system for reuse over and over again. After leaving the electrolysis cell, the pH of the brine is adjusted to between 10 and 12 so that impurities in the brine (such as metals and sulphates) can be removed by precipitation. pH measurement and control by the addition of Hydrochloric Acid (HCl) and Sodium Hydroxide (NaOH) is critical throughout the process.


The challenges of reliably measuring pH in brine applications is severe. KCl is typically used in pH probe reference junctions because the equivalent conductance of a Potassium ion (K+) and a Chloride ion (Cl-) are almost the same. The equivalent conductance of a Sodium ion is much less, a Hydronium ion much higher, causing signifi cant asymmetry potentials in the electronic circuit. This leads to measurement error and accelerated KCl diffusion across the electrode junction. Chlorinated brine pH is measured close to the electrolysis cell electrodes where very high electrical currents are present. These currents cause ground loops in the pH measurement circuit, creating offsets and shortening electrode life. In short, pH measurement in the process using traditional electrodes quickly becomes sluggish and inaccurate, causing waste of pH correction chemicals and impacting plant performance and yield.


REFEX pH and ORP electrodes - Non-porous reference interface


Please contact us - email info@refexsensors.com, call +353 (0)98 50034 or visit www.refexsensors.com


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IET March / April 2017 www.envirotech-online.com


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REFEX™ SENSORS LTD Unit 7, Section D, Westport Industrial Estate, Westport, Co. Mayo, Ireland


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The solution to these problems is a pH probe using a Refex Solid-State NON- POROUS reference interface - an electrochemically active, ionically conductive interface that forms an impenetrable barrier between the process brine from the Ag/AgCl electrode in 2.8 mol /l KCl electrolyte. Non-porous Refex Electrodes are immune to KCl loss/diffusion, ground-Loop currents (a liquid Earth should always be used) and to fouling and poisoning.


The Refex/pH and Refex ORP combined electrodes are the only ones that can withstand all Chlor-Alkali application challenges. The Patented NON-POROUS reference interface has solved all the problems of the past.


Refex – the First to Last.


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Customised Analysis Cases for Working in the Field


Aqualabo Analyse offers customers the option of adapting the items requested to design your fi eld laboratory:


Firstly, choose your case format and material; for example: ABS or aluminium.


Then, select your equipments and methods: plastic or glasswares (tubes, burette, syringe, pipette etc.), reagents and buffer solutions, pocket testers for PH, TDS, and Temperature, and your colorimetric methods: indicator paper or colour slides.


The different methods are simple and fast to use, and they don’t require any particular knowledge of chemistry.


The portable cases are robust and perfectly adapted to fi eld work. 100% made in France.


Many standard kits are also available for different applications including boiler, waste water, swimming pools etc.


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